﻿<p>The IfcOuterBoundaryCurve</em> defines the outer boundary of a bounded surface.</p>
<blockquote class="extDef">
NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
This is a special subtype of boundary curve which has the additional semantics of defining an outer boundary of a surface. No more than one such curve shall be included in the set of boundaries of a curve bounded surface.</blockquote>

<blockquote class="note">
NOTE&nbsp; Entity adapted from <strong>outer_boundary_curve</strong> in ISO 10303-42.
</blockquote>
<blockquote class="history">
HISTORY  New entity in IFC4.
</blockquote>